This document summarizes the morphology of the maxillary central and lateral incisors. It describes the labial, lingual, mesial, distal, and incisal surfaces of the central incisor including developmental grooves, lobes, and cervical curvature. Dimensions are provided. The central incisor is the widest anterior tooth and has the most pronounced mesial cervical curvature. Eruption timing and root development are also outlined. For the lateral incisor, it notes they are smaller than centrals and have more rounded mesioincisal and distoincisal angles, as well as more prominent marginal ridges and cingulum lingually.
I wanna share this to all dental students and colleagues. This is a simplified and concise description of the anatomical structure of a Permanent Maxillary Central Incisor.
Centered in the maxilla, one on either side of median line, with mesial surface of each in contact with mesial surface of other
Two in number
Larger than the lateral incisor
These teeth supplement each other in function, and they are similar anatomically
Shearing or cutting teeth
Major function is to punch and cut food material during the process of mastication
These teeth have incisal ridges or edges rather than
cusps such as are found on canines & posterior teeth
First evidence of calcification
Crown completion
Eruption
Root completion
3-4 months
4-5 years
7-8 years
10-11 years
Maxillary Second Premolar
the maxillary first premolar in function
Less angular ,rounded crown in all aspects.
Single root
Smaller crown cervico occlusally
Root length is as great or greater
BUCCAL ASPECT
Not as long as that of the first premolar
Less pointed
Mesial slope is
shorter than the distal slope
Buccal ridge of the crown may not be so prominent whencompared with the first premolarLINGUAL ASPECT
Lingual cusp is longer making the crown longer on the lingual sideMESIAL ASPECT
Cusps of second premolar are shorter with the buccal and lingual cusps more nearly the same length
Greater distance between cusp tips-that widens the occlusal surface buccolingually
No developmental depression on the mesial surface of the crown as on the first premolar
Crown surface is convex instead
No deep dev. Groove crossing the mesial marginal ridgeOCCLUSAL ASPECT
Outline of the crown is more rounded or oval rather than angular
Central dev. groove is shorter and more irregular
Tendency toward multiple supplementary grooves radiating from the central groove that may extend out to the cusp ridges
Makes for an irregular occlusal surface and gives a very wrinkled appearance
I wanna share this to all dental students and colleagues. This is a simplified and concise description of the anatomical structure of a Permanent Maxillary Central Incisor.
Centered in the maxilla, one on either side of median line, with mesial surface of each in contact with mesial surface of other
Two in number
Larger than the lateral incisor
These teeth supplement each other in function, and they are similar anatomically
Shearing or cutting teeth
Major function is to punch and cut food material during the process of mastication
These teeth have incisal ridges or edges rather than
cusps such as are found on canines & posterior teeth
First evidence of calcification
Crown completion
Eruption
Root completion
3-4 months
4-5 years
7-8 years
10-11 years
Maxillary Second Premolar
the maxillary first premolar in function
Less angular ,rounded crown in all aspects.
Single root
Smaller crown cervico occlusally
Root length is as great or greater
BUCCAL ASPECT
Not as long as that of the first premolar
Less pointed
Mesial slope is
shorter than the distal slope
Buccal ridge of the crown may not be so prominent whencompared with the first premolarLINGUAL ASPECT
Lingual cusp is longer making the crown longer on the lingual sideMESIAL ASPECT
Cusps of second premolar are shorter with the buccal and lingual cusps more nearly the same length
Greater distance between cusp tips-that widens the occlusal surface buccolingually
No developmental depression on the mesial surface of the crown as on the first premolar
Crown surface is convex instead
No deep dev. Groove crossing the mesial marginal ridgeOCCLUSAL ASPECT
Outline of the crown is more rounded or oval rather than angular
Central dev. groove is shorter and more irregular
Tendency toward multiple supplementary grooves radiating from the central groove that may extend out to the cusp ridges
Makes for an irregular occlusal surface and gives a very wrinkled appearance
Mandibular central incisors are two in number
Mandibular central incisor and lateral are similar in anatomy and complement each other in function
They are smaller than the maxillary central incisors
Mandibular central incisor erupts between the age of 7 and 8 years
First tooth from the midline in each lower quadrant
Permanent Maxillary Lateral Incisors-Dr Saba ArshadDr.Saba Arshad
Lecture on Maxillary Central Incisor-BDS 1st year
Learning Objectives;
1. To define and pronounce the terminologies of permanent dentition.
2. To label the anatomical landmarks of permanent maxillary central incisor.
3. To discuss the curves and segments of maxillary central incisors.
4. To be able to correctly draw the graph outline.
5. To be able to carve the teeth on wax models.
6. To discuss anatomical variations.
Reference;
1. Ash MM Jr 1993 Wheeler’s dental anatomy, physiology and occlusion, 7th edn. Saunders, Philadelphia
2. Berkovitz, B. K., G. R. Holland, et al. (2017). Oral Anatomy, Histology and Embryology E-Book, Elsevier Health Sciences.
MANDIBULAR LATERAL INCISOR
INTRODUCTION
Lateral incisors generally appear in the oral cavity after central incisors.
Lateral incisors usually erupts during the seventh year of life .
Roots complete: 9 – 10 years
FDI SYSTEM (Federation Dentaire Internationalae)-
Mandibular RIGHT lateral incisor- 42
Mandibular LEFT lateral incisor- 32
UNIVERSAL SYSTEM-
Mandibular RIGHT lateral incisor- 26
Mandibular LEFT lateral incisor- 23
Zsigmondy-palmar system
Mandibular RIGHT central incisor-
2
Mandibular LEFT central incisor-
2
ARCH TRAITS
Lingual fossa are less pronounced on mandibular incisors.
Mandibular lateral incisors have roots that are more triangular in cross section.
Labio-lingual diameter is wider than mesio-distal diameter.
CLASS TRAITS-
Crown shapes are rectangular, longer inciso-gingivally than mesio-distally.
Mesial & distal marginal ridge converge toward the lingual cingulum.
SET TRAIT
There are depression or perikymata on the labial surface of the crown of the incisors.
Mammelons are seen on the incisal edge of newly erupted incisors.
Cervical ridges of anterior permanant teeth are prominent than primary teeth.
TYPE TRAIT
Lateral incisors have distal proximal contact more apical than the mesial contact.
Lateral incisors have disto-incisal angle more rounded than the mesio-incisal angle.
Labial Aspect
Crown is trapezoidal from labial aspect.
Mesial outline is almost straight in line with mesial outline of root.
Distal outline is straight near cervix and become slightly convex as it reaches distoincisal angle.
Distoincisal angle more rounded than mesioincisal angle
Incisal outline formed by incisal ridge is straight but has tendency to slope cervically in distal direction.
Cervical line is curved apically.
Crown is not bilaterally symmetrical
Distal half is slightly larger.
lingual aspect
Its shape is trapezoidal like labial surface.
Crown tapers lingually making lingual surface narrower than labial surface.
Shallow lingual fossa
Lingual surface is smooth devioid of developmental grooves, and is convex near cingulum.
Distal surface bulges from the incisal view
incisal aspect
It is oval labiolingually.
Labiolingual dimension is greater than mesiodistal.
Incisal ridge is at an angle to the line bisecting the tooth labiolingually rather than being perpendicular.
Slightly twisted on its root base from this aspect.
Cingulum twisted (off-center) to the distal
mesial aspect
Mesial aspect is triangular
Labial outline is convex near cervical line
Lingual outline is straight in incisal 3rd
Incisal edge lingual to root axis line
CEJ is curved more on the mesial than the distal
Mesial contact area is at incisal 3rd of crown
Mesial surface is longer than distal surface
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2. Contents
Morphology of Permanent Maxillary Central Incisor
Chronology and dimensions of Maxillary Central Incisor
Brief morphology of Maxillary Lateral Incisor
Objectives
Identification of maxillary incisors from other teeth
Understand the morphology of maxillary central and
lateral incisor
Distinguish between the labial, lingual, mesial, distal and
incisal surfaces of the maxillary incisors
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3. Introduction
Maxillary incisors are four in number
Maxillary central incisor and lateral are similar in
anatomy and complement each other in function
Their major function is to cut food
Maxillary central incisor erupts between the age of 7
and 8 and it is the second permanent tooth to erupt
Maxillary lateral incisor erupts between the age of 8
and 9
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6. Labial aspect
The mesial margin is straight and meets the incisal
edge at right angle. The distal margin is shorter and
more rounded.
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Mesial margin
straight
Distal margin
shorter &
rounded
7. The distoincisal angle is more rounded than the
mesioincisal angle.
Distoincisal
angle more
rounded
Mesioincisal
angle rounded
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8. The labial surface is marked by two developmental
groove and has convexity in cervical third.
Convexity in
cervical third a b
a & b: Developmental depressions
1,2 & 3: Lobes (4th
lobe not visible)
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9. Maxillary central incisor is the widest anterior tooth
mesiodistally
Widest anterior teeth
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11. Lingual aspect
The crown profile is same as that of labial surface
except that there is a broad depression in the central
portion called the lingual fossa and a well developed
cingulum.
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Lingual fossa
Cingulum
Marginal
ridges
Lingual ridge
12. Dr.Syed Sadatullah King Khalid University
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The lingual fossa is bordered by mesial and distal
marginal ridges on the sides and the cingulum
cervically.
The cervical line on labial and lingual surface is
convex apically.
Cervical line
convex
Lingual aspectLabial aspect
14. Mesial aspect
From the mesial aspect the labial margin is convex
The lingual margin is ‘S’ shaped, being convex near
cingulum and concave in the middle
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Labial margin
convex
Convex near
cingulum
Concave in the
middle
15. Mesial curvature of cervical line (3.5mm) is the most
pronounced compared to any other tooth.
The cervical line on the mesial and distal surface is
convex incisally
Cervical line
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16. Dr.Syed Sadatullah King Khalid University
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Distal aspect
Distal aspect
Distal surface is very similar to the mesial surface.
17. Incisal aspect
The crown and incisal margin are centered over root
Crown profile is almost bilaterally symmetrical
The incisal margin of newly erupted teeth show three
elevations called mamelons. They correspond to the
developmental lobes
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18. Dr.Syed Sadatullah King Khalid University
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Incisal ridge
Incisal aspect
Bilaterally symmetrical
19. Root
The root is straight and tapers from the cervical line to
the apex giving it a conical shape
The root ends in a blunt apex.
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Straight conical
blunt root
20. 3.5 2.56.07.07.08.513.010.5
Curvature of
Cervical Line
M D
Labiolingual
Diameter at
Cervical Line
Labiolingual
Diameter at
Crest of Curvature
Mesiodistal
Diameter at
Cervical Line
Mesiodistal
Diameter at
Contact Area
Root
Length
Crown
Length
Average Dimensions in millimeters
Contact Area
Max C.I
Mesial Distal
I3 JIM3
I3- Incisal third
JIM3-Junction of incisal &
middle third
CHRONOLOGY
Appearance of enamel organ 5 m.i.u
First evidence of calcification 3-4 months
Crown completion 4-5 years
Eruption 7-8 years
Root completion 10-11 years
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21. Dr.Syed Sadatullah King Khalid University
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Maxillary Lateral Incisor
The general shape is similar to maxillary central
incisors except that they are shorter and narrower.
Next to third molars maxillary lateral incisors are
the teeth that show most variation in crown size,
shape and form
Maxillary central incisor bigger
and lateral incisor smaller
22. The mesioincisal and distoincisal angles are more
rounded than the corresponding angles of the
maxillary central incisor
Distoincisal
angle more
rounded
Mesioincisal
angle more
rounded
Maxillary Lateral Incisor
Maxillary Central Incisor
Mesioincisal
angle
Distoincisal
angle
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23. On the lingual aspect the marginal ridges and cingulum
are more prominent
Prominent
cingulum
Prominent
marginal ridges
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24. Labial aspect Lingual aspect
Mesial aspect Distal aspect
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